Guest nochain Posted May 19, 2008 Share Posted May 19, 2008 Ok I just did a motor swap last week in my z31 its an 87 turbo. Its been runing ok but kinda stumbles when i get into boost it just started doing this last night. I do have a small crack in my turbo manifoild, it makes kinda of a wine when i'm about half throttle but goes away once i give it more gas. I do have a spare turbo would it be worth my while to use that one. I have cheaked for vacume leaks but so far havent found one. I do have an intercoller and bov if this helps also i did cheack for loose clamps. Quote Link to comment Share on other sites More sharing options...
evildky Posted May 19, 2008 Share Posted May 19, 2008 are you able to get and hold boost? I had a similar problem that turned out to be a failing fuelpump, once I got a bit of boost it was too much for the fuel pump so it would cut off Quote Link to comment Share on other sites More sharing options...
Guest nochain Posted May 19, 2008 Share Posted May 19, 2008 it stumbles going into boost and then kinda surges Quote Link to comment Share on other sites More sharing options...
stony Posted May 20, 2008 Share Posted May 20, 2008 Hmmmm... I'm thinking you have an ignition or fueling issue. Turbo's don't really "stumble" Turbo's either work or they don't and there is usually a pretty obvious reason when they don't work Quote Link to comment Share on other sites More sharing options...
Guest nochain Posted May 21, 2008 Share Posted May 21, 2008 well i guess ill start by instaling my msd fuel pump its 1000 hp capable if that dont work idk what else i should do cause i have new plugs and wires any recomendations Quote Link to comment Share on other sites More sharing options...
aplyedmind Posted December 16, 2009 Share Posted December 16, 2009 My car stumbles also when i step on it kinda like a flutter or something ...It says on my boost gauge I'm boosting 9psi. But i don't feel like am . I dont know what it is. Quote Link to comment Share on other sites More sharing options...
jc052685 Posted December 16, 2009 Share Posted December 16, 2009 My car stumbles also when i step on it kinda like a flutter or something ...It says on my boost gauge I'm boosting 9psi. But i don't feel like am . I dont know what it is. Make your own thread and give us some information we could use to help you. Quote Link to comment Share on other sites More sharing options...
jc052685 Posted December 16, 2009 Share Posted December 16, 2009 Hmmmm... I'm thinking you have an ignition or fueling issue. Turbo's don't really "stumble" Turbo's either work or they don't and there is usually a pretty obvious reason when they don't work I would start with checking the timming. Set it to spec via the FSM. Then I would check fuel preasure under load. Maybe replace the fuel filter. Then if none of that solves the problem start looking at the AFM and all of the electrical connections on the motor. These cars are getting old and build alot of heat under that hood. Make sure all of the grounds are 100% also. Quote Link to comment Share on other sites More sharing options...
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